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21,000,000 ells is about four times as long as The Great Wall of China (wall only)
In other words, it's 3.8350 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 0.26080 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 5,476,000 ells. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
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